Electronic Device for Discharging Liquid Using Sound Having Adjusted Center Frequency and Sound Pressure, and Method Therefor

2. The electronic device of claim 1, wherein the center frequencies are frequencies at points showing substantially highest sound pressures in the plurality of frequency bands, respectively.

4. The electronic device of claim 3, wherein the first period of time and the second period of time are separated by a first time interval and the second period of time and the third period of time are separated by a second time interval.

6. The electronic device of claim 4, wherein the first time interval is different from the second time interval.